/Engine/Source/Developer/BSPUtils/Public/BSPUtils.h
Populates a list with all polys that are linked to the specified poly. The resulting list includes the original poly.
static void polyGetLinkedPolys ( [ABrush](API\Runtime\Engine\Engine\ABrush) * InBrush, [FPoly](API\Runtime\Engine\Engine\FPoly) * InPoly, [TArray](API\Runtime\Core\Containers\TArray)< [FPoly](API\Runtime\Engine\Engine\FPoly) > * InPolyList )